2017-07-18 11:20:42

by Jaya Durga

Subject: [PATCH v2 3/3] Staging: iio: adc: ad7280a.c: Fixed Macro argument reuse

CHECK: Macro argument reuse 'addr' - possible side-effects?

convert AD7280A_DEVADDR to ad7280a_devaddr static function
to fix checkpath check

Signed-off-by: Jaya Durga <[email protected]>
---
drivers/staging/iio/adc/ad7280a.c | 21 +++++++++++++--------
1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/iio/adc/ad7280a.c b/drivers/staging/iio/adc/ad7280a.c
index d5ab83f..f543b42 100644
--- a/drivers/staging/iio/adc/ad7280a.c
+++ b/drivers/staging/iio/adc/ad7280a.c
@@ -99,9 +99,14 @@
#define AD7280A_DEVADDR_MASTER 0
#define AD7280A_DEVADDR_ALL 0x1F
/* 5-bit device address is sent LSB first */
-#define AD7280A_DEVADDR(addr) (((addr & 0x1) << 4) | ((addr & 0x2) << 3) | \
- (addr & 0x4) | ((addr & 0x8) >> 3) | \
- ((addr & 0x10) >> 4))
+static unsigned int ad7280a_devaddr(unsigned int addr)
+{
+ return ((addr & 0x1) << 4) |
+ ((addr & 0x2) << 3) |
+ (addr & 0x4) |
+ ((addr & 0x8) >> 3) |
+ ((addr & 0x10) >> 4);
+}

/* During a read a valid write is mandatory.
* So writing to the highest available address (Address 0x1F)
@@ -372,7 +377,7 @@ static int ad7280_chain_setup(struct ad7280_state *st)
if (ad7280_check_crc(st, val))
return -EIO;

- if (n != AD7280A_DEVADDR(val >> 27))
+ if (n != ad7280a_devaddr(val >> 27))
return -EIO;
}

@@ -511,7 +516,7 @@ static int ad7280_channel_init(struct ad7280_state *st)
st->channels[cnt].info_mask_shared_by_type =
BIT(IIO_CHAN_INFO_SCALE);
st->channels[cnt].address =
- AD7280A_DEVADDR(dev) << 8 | ch;
+ ad7280a_devaddr(dev) << 8 | ch;
st->channels[cnt].scan_index = cnt;
st->channels[cnt].scan_type.sign = 'u';
st->channels[cnt].scan_type.realbits = 12;
@@ -558,7 +563,7 @@ static int ad7280_attr_init(struct ad7280_state *st)
for (ch = AD7280A_CELL_VOLTAGE_1; ch <= AD7280A_CELL_VOLTAGE_6;
ch++, cnt++) {
st->iio_attr[cnt].address =
- AD7280A_DEVADDR(dev) << 8 | ch;
+ ad7280a_devaddr(dev) << 8 | ch;
st->iio_attr[cnt].dev_attr.attr.mode =
0644;
st->iio_attr[cnt].dev_attr.show =
@@ -574,7 +579,7 @@ static int ad7280_attr_init(struct ad7280_state *st)
&st->iio_attr[cnt].dev_attr.attr;
cnt++;
st->iio_attr[cnt].address =
- AD7280A_DEVADDR(dev) << 8 |
+ ad7280a_devaddr(dev) << 8 |
(AD7280A_CB1_TIMER + ch);
st->iio_attr[cnt].dev_attr.attr.mode =
0644;
@@ -918,7 +923,7 @@ static int ad7280_probe(struct spi_device *spi)
if (ret)
goto error_unregister;

- ret = ad7280_write(st, AD7280A_DEVADDR(st->slave_num),
+ ret = ad7280_write(st, ad7280a_devaddr(st->slave_num),
AD7280A_ALERT, 0,
AD7280A_ALERT_GEN_STATIC_HIGH |
(pdata->chain_last_alert_ignore & 0xF));
--
1.9.1

2017-07-18 11:29:23

by Dan Carpenter

Subject: Re: [PATCH v2 3/3] Staging: iio: adc: ad7280a.c: Fixed Macro argument reuse

On Tue, Jul 18, 2017 at 04:45:04PM +0530, Jaya Durga wrote:
> CHECK: Macro argument reuse 'addr' - possible side-effects?
>
> convert AD7280A_DEVADDR to ad7280a_devaddr static function
> to fix checkpath check
>
> Signed-off-by: Jaya Durga <[email protected]>
> ---

Put a little changelog here:

v2: small style changes

> drivers/staging/iio/adc/ad7280a.c | 21 +++++++++++++--------
> 1 file changed, 13 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/staging/iio/adc/ad7280a.c b/drivers/staging/iio/adc/ad7280a.c
> index d5ab83f..f543b42 100644
> --- a/drivers/staging/iio/adc/ad7280a.c
> +++ b/drivers/staging/iio/adc/ad7280a.c
> @@ -99,9 +99,14 @@
> #define AD7280A_DEVADDR_MASTER 0
> #define AD7280A_DEVADDR_ALL 0x1F
> /* 5-bit device address is sent LSB first */
> -#define AD7280A_DEVADDR(addr) (((addr & 0x1) << 4) | ((addr & 0x2) << 3) | \
> - (addr & 0x4) | ((addr & 0x8) >> 3) | \
> - ((addr & 0x10) >> 4))
> +static unsigned int ad7280a_devaddr(unsigned int addr)
> +{
> + return ((addr & 0x1) << 4) |
> + ((addr & 0x2) << 3) |
> + (addr & 0x4) |
> + ((addr & 0x8) >> 3) |
> + ((addr & 0x10) >> 4);

This indenting makes no sense though. You're almost but not quite
making the '|' characters line up. When I did it, I added space
characters to make it work:

return ((addr & 0x1) << 4) |
((addr & 0x2) << 3) | <- 1 tab and 7 spaces
(addr & 0x4) | <- 2 tabs
((addr & 0x8) >> 3) |
((addr & 0x10) >> 4);

regards,
dan carpenter